Siemens 405-8RLY-I Relay Output Module 8 Points

Siemens 405-8RLY-I Relay Output Module for the TI 405 PLC provides eight isolated relay contacts to expand discrete output capability within a Siemens TI 405 backplane. The eight outputs are arranged as four Form A (SPST, normally open) and four Form C (SPDT) relays, all isolated from the controller to minimize interference and ground-loop issues. The module supports a coil supply range of 12–24 V DC or 12–240 V AC and delivers up to 5 A per point, with a total module rating of 40 A. Eight isolated common terminals simplify wiring, and the outputs are specified as no-suppression (no built-in snubber). This makes the 405-8RLY-I well-suited for driving coils, contactors, solenoids, and other discrete loads in legacy Siemens TI 405 installations, while maintaining clear separation between control logic and switched power. In catalogs and listings, the device is commonly referenced as 405-8RLY-I (and sometimes 405-8RLY-1), reflecting its role as the dedicated eight-point relay output module for TI 405 systems.